Which of these is a Thai island?

Ko Samui, often called just Samui is an island of great natural beauty and variety in the Gulf of Thailand. The palm-fringed shoreline and coconut and fruit cultivation of the coastal lowlands rise to a central granite massif, the slopes of which are cloaked in virgin rainforest.

Ko Samui is the second biggest island in Thailand after Phuket. It is about 700 km (430 mi) south of Bangkok and 80 km (50 mi) from the eastern coastline of Southern Thailand. The most popular and commercialised beaches are Chaweng and Lamai, while the northern beaches and their adjacent villages of Mae Nam, Bophut, Bang Rak (Big Buddha) and Choeng Mon are more peaceful choices, and the west coast beaches are still (comparatively) quiet.

Samui is home to some 50,000 full-time inhabitants, 90% of whom are Buddhist. The island was probably first inhabited about 15 centuries ago, settled by fishermen from the Malay Peninsula and south China. The origin of the name Samui is unknown.

Lombok, Sumbawa and Sumatra are all Indonesian islands.