The island of Montserrat is located approximately 480 km (300 miles) east-southeast of Puerto Rico and 48 km (30 miles) southwest of Antigua. It comprises 104 km² (40 square miles) but is currently gradually increasing in size owing to the buildup of volcanic deposits on the southeast coast. The island is 16 km (10 miles) long and 11 km (7 miles) wide, with rock cliffs rising 15 to 30 m (50–100 feet) above the sea and a number of smooth bottomed sandy beaches scattered among coves on the western (Caribbean) side of the island.

Montserrat has two islets, Little Redonda and Virgin, and Statue Rock.