Three to five metres of shoreline has been submerged every year since then, resulting in the loss of 4,000 rai of land to the sea.

According to Thailand's Department of Marine and Coastal Resources, a quarter of the country's shores—about 700 kilometres (500 miles)—are eroding, some "severely".

[4] The district is named after the temple Phra Samut Chedi, which was built 1827–1828 by King Buddha Loetla Nabhalai (Rama II) on an island in the Chao Phraya River—hence its popular name Phra Chedi Klang Nam ('chedi in the middle of the water').

At the mouth of the Chao Phraya is Chulachomklao Fort, built in 1819 and came into use only once during the Paknam crisis in the same year.

The HTMS Maeklong, a former training ship of the Royal Thai Navy, is another attraction in the park.