The Complete Guide to Open-Water Swimming Safety in Taiwan’s Waters: A Triathlete’s Handbook from Kenting to Northeast Coast

Taiwan is a triathlete’s paradise—surrounded by sea on all sides, with a warm climate that allows for open-water training nearly year-round. However, Taiwan’s waters also carry risks that should not be underestimated: strong currents, sudden weather changes, and seasonal hazardous marine life. This article provides a comprehensive safety guide for Taiwan’s major triathlon training and race waters.

Basic Characteristics of Taiwan’s Waters

Ocean Current Systems

Taiwan is influenced by three major ocean current systems:

• Kuroshio Current: A warm current flowing northward along Taiwan’s eastern coast, with speeds reaching 1-2 knots (approximately 0.5-1 m/s), affecting the eastern and southern waters
• China Coastal Current: A cold current flowing southward along Taiwan’s western coast in winter, bringing lower water temperatures
• South China Sea Warm Current: Affects the southwestern waters of Taiwan

Annual Water Temperature Calendar

Month	Northern Waters	Southern Waters	Eastern Waters
Jan-Feb	16-19°C	22-24°C	21-23°C
Mar-Apr	19-22°C	24-26°C	23-25°C
May-Jun	23-26°C	26-28°C	25-27°C
Jul-Aug	27-30°C	28-30°C	27-29°C
Sep-Oct	25-28°C	27-29°C	26-28°C
Nov-Dec	20-23°C	24-26°C	23-25°C

Northern Waters Training Guide

Feitsui Bay / Wanli

Characteristics:

• Curved bay, relatively calm
• Sandy seabed with gradual depth progression
• Venue for multiple triathlon events

Safety Precautions:

• Strong northeast monsoon winds during autumn and winter, with waves reaching 2-3 meters
• Circulation currents can occasionally form within the bay, pulling swimmers toward the bay mouth
• Occasional jellyfish sightings in summer

Recommended Training Hours: May-October, 5:30-7:30 AM (when wind and waves are minimal)

Fulong / Gongliao

Characteristics:

• Estuary of the Shuangxi River, featuring sandbar topography
• Venue for major events such as IRONMAN Taiwan
• Training possible both inside the river mouth and in the open sea

Safety Precautions:

• Strong inflow and outflow currents at the river mouth, significantly affected by tidal changes
• Wave conditions in the open sea area are less stable
• Water depth decreases during low tide; watch out for submerged rocks

Recommendation: Beginners should train inside the river mouth; advanced swimmers can train in the open water area

Keelung Waimushan

Characteristics:

• Natural rocky coastline with significant depth variations
• Popular gathering spot for local swimmers with community support
• Generally good water quality

Safety Precautions:

• Be careful of slipping when entering and exiting the water on the rocky shore
• Complex underwater terrain with submerged rocks and trenches
• Be aware of and yield to boat traffic lanes

Southern Waters Training Guide

Kenting South Bay / Little Bay

Characteristics:

• Taiwan’s warmest waters, swimmable year-round
• Rich coral reef topography
• Designated venue for multiple triathlon events

Safety Precautions:

• During the fall wind season (Oct-Mar), winds are extremely strong and sea conditions are severe
• Avoid standing on or touching coral reef areas (to protect both the environment and yourself)
• Records of Portuguese man o’ war sightings in summer
• Water activity areas may overlap with tourist recreation zones

Recommendation: Avoid the fall wind season, or choose bays on the leeward side for training

Peng Bay / Dapeng Bay

Characteristics:

• Lagoon topography with mirror-calm water surface
• IRONMAN 70.3 Taiwan race venue
• Shallow water depth, suitable for beginners

Safety Precautions:

• Water quality is significantly affected by rainfall
• Water exchange occurs at the lagoon mouth
• Water temperature can become excessively high in summer (exceeding 30°C)

Kenting Houbihu

Characteristics:

• Semi-enclosed bay with relatively mild wave conditions
• Good visibility with excellent underwater sightlines
• Suitable for mid-to-long distance training

Safety Precautions:

• Stronger currents at the bay entrance
• Sudden depth changes in coral reef areas
• Many divers in the area; be mindful of yielding to them

Eastern Waters Training Guide

Hualien Qixingtan

Characteristics:

• Spectacular Pacific Ocean views
• Pebble beach with abrupt depth changes

Safety Precautions:

• Extremely dangerous rip currents: Qixingtan is one of Taiwan’s most notorious hazardous waters
• Large and irregular waves; the surf zone is narrow but violent
• Strongly not recommended as an open-water training venue

Taitung Living Lake

Characteristics:

• Artificial lake designed specifically for water sports
• Calm water surface with no waves or currents
• Taitung Beauty Triathlon race venue

Safety Precautions:

• Water quality occasionally deteriorates due to algae blooms
• Thick silt layer on the lakebed; do not stand
• No shade available; pay attention to sun protection and hydration

Recommendation: The safest open-water training venue in eastern Taiwan

Hazardous Marine Life in Taiwan’s Waters

Jellyfish

Species	Area of Occurrence	Season	Danger Level
Portuguese man o’ war	Southern, Eastern	Spring-Summer	High (severe pain, medical attention required)
Moon jellyfish	Coastal waters across Taiwan	Summer-Autumn	Low (mild stinging)
Box jellyfish	Southern offshore waters	Summer	Extremely high (rare but fatal)

Preventive Measures:

• Wear a wetsuit or stinger suit to cover the skin
• Ask locals about recent jellyfish conditions before heading out
• If stung, rinse with seawater (not freshwater), remove tentacles, and seek immediate medical attention for severe cases

Other Marine Life to Watch For

• Sea urchins: Commonly found in rocky shore and coral reef areas; avoid touching the bottom with your feet
• Stingrays: Occasionally seen on sandy seabeds; shuffle your feet when entering the water rather than stepping directly
• Sea snakes: Occasionally sighted in eastern and southern waters; usually not aggressive, simply maintain distance

Assessing Weather and Sea Conditions

Must-Check Information Before Heading Out

1. Central Weather Administration Marine Forecast: Check wave height, wind speed, and tides
2. Wind Forecast: Do not enter the water when wind speed exceeds Force 5 (8 m/s)
3. Tide Tables: Understand high and low tide times; avoid strong currents during spring tides
4. Typhoon Updates: Even hundreds of kilometers away, a typhoon’s outer circulation can generate long-period swells

On-Site Assessment Criteria

Conditions for Safe Entry:

• Wave height below 1 meter
• Wind speed below Force 4
• Good visibility
• No signs of abnormal currents
• Other swimmers or lifeguards present

Absolute No-Go Conditions:

• Maritime warning issued by the Central Weather Administration
• Wave height exceeding 1.5 meters
• Visibility below 50 meters
• Thunderstorm forecast
• No other people on site

Safety Equipment Checklist

Essential Equipment

• Swim Buoy: Orange or fluorescent inflatable buoy attached to the waist
• Brightly Colored Swim Cap: Orange or fluorescent yellow to increase visibility
• Anti-Fog Goggles: Ensure clear vision
• Wetsuit or Stinger Suit: Choose based on water temperature

Recommended Equipment

• Waterproof Phone Pouch: Stored inside the swim buoy for emergency communication
• Whistle: Attached to goggle strap or swim cap for signaling for help
• Sunscreen: SPF50+, waterproof formula designed for water activities
• Goggle Anti-Fog Solution: Essential for long-distance swimming

Emergency Situations and Response

Muscle Cramps

1. Do not panic; roll onto your back and float
2. Stretch the cramped muscle (calf: pull toes toward your body)
3. Gently massage the muscle
4. Once recovered, swim back to a safe area slowly using breaststroke

Swallowing Water / Choking

1. Stop swimming and roll onto your back to float
2. Cough to expel the water; do not try to suppress it
3. Resume only after breathing has returned to normal
4. If coughing persists or breathing becomes difficult, get out of the water immediately

Exhaustion

1. Switch to energy-efficient strokes such as breaststroke or sidestroke
2. Use the swim buoy to rest
3. Move toward shore or the nearest safe point
4. Raise your hand to signal for help if necessary

Conclusion

Taiwan’s waters provide triathletes with a world-class open-water training environment, but safety should always be the top priority. Understanding the characteristics of your training waters, bringing along the proper safety gear, and always swimming with a buddy—these three simple principles can keep you safe while you enjoy the ocean. The sea is the best coach, but only if you first learn to respect it.

Related Reading

• Adapting to Waves and Currents in Open-Water Swimming: Key Techniques for Swimming Along Taiwan’s Coast
• Taiwan’s Beach Culture and Swimming Safety: Understanding Wave Conditions and Rip Currents
• Open-Water Swimming Safety Guide: Dealing with Tides, Water Temperature, and Visibility
• Reading Tides and Ocean Currents: How to Use the Flow to Save Energy