Located in the heart of mainland Southeast Asia, Thailand is a country of mountains, hills, plains and a long coastline along the Gulf of Thailand (1,875 km) and the Andaman Sea (740 km), not including the coastlines of some 400 islands, most of them in the Andaman Sea.Its continental co-ordinates are latitudes 20° 28’ N and 5° 36’ S and longitudes 105° 38’ E and 97° 22’ W.To the north Thailand borders the Lao PDR and Myanmar; to the east the Lao PDR and Cambodia; to the south Malaysia; and to the west Myanmar. The country’s land-based maximum north-south extent is approximately 1,600 km, and its maximum east-west extent measures approximately 870 km.