Baltazar Island is the outermost and most mysterious of the Tres Reyes Islands. It is distinguished by its operational American-colonial era lighthouse (Faro de Isla Baltazar), which guides maritime traffic traversing the treacherous currents of the Tablas Strait. The island's coastline features a mix of jagged volcanic rocks and secluded pebble coves. The true treasure of Baltazar lies beneath the surface. The island's eastern drop-off is universally regarded as the premier scuba diving destination in Marinduque. The underwater wall plunges to dizzying depths and is heavily decorated with massive sea fans, gorgonians, and vibrant soft corals, frequented by sea turtles and schools of jacks. **Traveler Logistics:** Reaching Baltazar requires a 45-minute boat ride from Gasan. Due to strong ocean currents, scuba diving here should only be attempted by advanced certified divers accompanied by experienced local divemasters.