Ko samet is south of the rayong coast it is only 6 kilometres long and 3 kilomkilometres wide sunthorn phu a famous Thai poet wrote his first poem- phra aphaimani here phrase aphamani was a prince agiantess from under the water fell in love with him a mermaid helped him to go to ko samet the giantess followed but the prince played his magic flute and she fell asleep the prince later married a beautiful princess