Major Lakes of Thailand: Natural & Reservoir Highlights

Thailand's significant lakes range from natural freshwater bodies to massive hydroelectric reservoirs, each with ecological and economic importance.

1. Thale Sap Songkhla (Songkhla Lake)

• Type: Natural coastal lagoon / brackish lake.
• Area: ~1,040 km² — Thailand's largest.
• Location: Songkhla Province, south.
• Features: Connected to Gulf of Thailand; rich biodiversity (water lilies, lotus, fish); Ramsar wetland site.

2. Phayao Lake (Kwan Phayao)

• Area: ~118 km².
• Location: Phayao Province, north.
• Features: Scenic, hill-framed; Wat Chom Thong (16th-c. temple) on shore; community fisheries.

3. Ubol Ratana Reservoir

• Type: Artificial (Nam Pong River dam).
• Area: ~400 km².
• Location: Khon Kaen Province, northeast (Isan).
• Purpose: Irrigation, drinking water, hydropower, tourism (fishing, boating, birding).

4. Cheow Lan Lake (Ratchaprapha Dam)

• Type: Artificial (Khlong Saeng River dam).
• Area: ~165 km².
• Location: Khao Sok National Park, Surat Thani, south.
• Features: Limestone karst towers, rainforest, floating raft houses; kayaking, trekking.

5. Songkhla Lake (Thale Sap Thale Noi)

• Area: ~10 km² (smaller northern section of Thale Sap system).
• Location: Near Songkhla city.
• Features: Urban recreation, parks, birdwatching.

These lakes support fisheries, tourism, water security, and biodiversity across Thailand's diverse regions.