|The Marshall Islands in Micronesia in the Pacific Ocean comprise two tropical island chains of 29 atolls and 1,152 islands, formed from low coral limestone and sand. They are about half-way between Hawaii and Australia. A number of the islands are off-limits to local people and tourists alike because of a US military presence or the residue of nuclear testing. Elsewhere the Marshall Islands are known for their traditional weaving and boat-building methods. Although some of the islands and their surrounding sea areas are affected by pollution, others provide excellent opportunities for sailing and diving.