In geographical terms the Caribbean area includes the Caribbean Sea and all of the islands located to the southeast of the Gulf of Mexico, east of Central America and Mexico, and to the north of South America.
An HSA is a special, tax-advantaged savings account you can use to pay for qualified medical expenses. You deposit money in your HSA, where it earns interest tax-free. Funds are not taxed when withdrawn for qualified medical expenses.
General Flexible Spending Arrangements (FSAs) will probably make you ineligible for an HSA. If your employer offers a limited purpose (limited to dental, vision or preventive care) or post-deductible (pay for medical expenses after the plan deductible is met) FSA, then you can still be eligible for an HSA.