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Jamaica, about 235 km (146 mi) long and 82 km (51 mi) at its widest point, is bisected by highlands, trending east and west, that cover 80% of the island. The highest elevations are in the Blue Mountains to the east. The coastal plains are widest and most arid to the south. Most of the soil of the island, particularly in the central section, contains a high percentage of limestone, making cultivation difficult. Rainwater does not remain near the surface but percolates through the limestone soil to unusable depths. The island has few large rivers; only the Black River is navigable. The mean annual temperature is about 27 degrees C (80 degrees F) on the coast. Annual rainfall averages 1,955 mm (77 in), but it reaches 5,080 mm (200 in) in some mountainous regions. Jamaica has a great diversity of vegetation, although many areas have been cleared for agriculture.