thumb|250px|Prasae River
Pak Nam Krasae (Thai: ปากน้ำกระแส, in Thai pronounced as /pàːk náːm krā.sɛ̌ː/) is a tambon (sub-district) of Klaeng District, Rayong Province in eastern Thailand.
"Pak Nam Krasae", also known as "Pak Nam Prasae" (Thai: ปากน้ำประแส, in Thai pronounced as /pàːk náːm prā.sɛ̌ː/), literally means "estuary of Krasae (Prasae) River", according to the nature of its terrain. It is a community is an ancient community since the Ayutthaya period, not less than 200 years old.
Its name is assumed to be from Chong language Sae (แซรฺ), which means 'rice field'.[1]
Pak Nam Krasae is a riverside community, The community is rich with natural resources and diverse in cultures. The population lives in the community are Thai and Thai Chinese. Pak Nam Krasae community area has both the waterfront and not next to the waterfront.
Pak Nam Krasae has an area of 3,037.50 rais (4.866 square kilometers). It is located in the southeast of Klaeng District, away from district office southeastward along Sukhumvit Road (Highway 3) about 171NaN1 and about 631NaN1 from Rayong City via Sukhumvit Road, with about 2001NaN1 from Bangkok.
The contact territories are as follows (from north clockwise): Khlong Pun, Phang Rat, Prasae River (empties into the Gulf of Thailand), and Neun Kho.
Prasae (Krasae) River is a main watercourse of the area. The river is about 451NaN1 long, originating from the mountains in Chanthaburi Province, currents into Rayong through many creeks and canals, as far as empties into the Gulf of Thailand at Pak Nam Krasae. The distance flows through Pak Nam Krasae is about 81NaN1.
Most of the area is a coastal plain that slopes down to the Gulf of Thailand southward, which has an indented coastline adjacent to the Gulf of Thailand, approximately 31NaN1 long.[2]
Pak Nam Krasae is also rich in mangrove forests.
The area is governed by the Subdistrict-Municipality Pak Nam Prasae (เทศบาลตำบลปากน้ำประแส).
Almost half of the population who live along the waterfront are fishing. While the people who settled in the area and are not adjacent to the waterfront, work as rice farmers and orchard cultivators. The tourism industry is another important source of income for the local.