Shaped roughly like a triangle, the country has a 2,800 km which includes numerous islands in the Caribbean, and in the northeast borders the northern Atlantic Ocean. Most observers describe Venezuela in terms of four fairly well-defined topographical regions: the Maracaibo lowlands in the northwest, the northern mountains extending in a broad east-west arc from the Colombian border along the northern Caribbean coast, the wide plains in central Venezuela, and the Guiana Highlands in the southeast.