Like other islands in the Little Antilles, the islands
have a bedrock of young tertiary and quaternary limestones
and sandstones. However, Antigua's southwestern part
consists of tertiary, basic volcanoes, which provide a much
more hilly terrain than in other parts, with altitudes up to
400 m above sea level. According to
COUNTRYAAH, the coast on this part of the island
is also higher and steeper, while the northeast coast is
known for its low sandy beaches, coral reefs and many small
ports. There are no active volcanoes, but earthquakes.
The climate is warm all year round, and the rainfall that
the northeast pass brings in is moderate. No actual
watercourses are missing, and troublesome drought can occur.
There were five national parks in Antigua and Barbuda in
2009, two of which, Diamond Reef and Palaster Reef, are
marine national parks.