The South of the Island features a small coastal plain around Castletown and Ballasalla but is otherwise hilly and on the South west coast these hills rise up to more prominent peaks such as South Barrule and Cronk ny Arrey Laa which drops almost vertically into the sea .
The south of the island has a small coastal plain around Castletown and Ballasalla but is otherwise hilly . 
 In the south west these hills rise to more prominent peaks , notably South Barrule ( 483 m ) , and Cronk ny Arrey Laa ( 437 m ) which drops almost vertically into the sea .