Charco Manso & Charco Azul (Natural Seawater Pools of El Hierro)

El Hierro's coastline is renowned for its natural seawater pools formed by volcanic rock — the best examples are **Charco Manso** (near La Restinga, south coast) and **Charco Azul** (near El Mocanal, north-east coast). **Charco Manso** is a series of volcanic rock pools just west of La Restinga's harbour, created where lava flows have created natural basins filled with crystal-clear Atlantic water. The pools are protected from wave action by outer lava formations, making for calm swimming in an extraordinary setting. The pools are popular with families and snorkellers — the clear water reveals small fish, crabs, and sea anemones among the rocks. Access is via a short path from La Restinga village. **Charco Azul** ("Blue Pool") on the north-east coast near the town of El Mocanal is a larger natural pool complex with steps, ladders, and handrails for safe access — one of the most popular swimming spots on the island. The pool is filled by the tide and refreshed naturally, and is surrounded by lava formations. Facilities include showers and parking. Both are free and open to the public. No lifeguard at either — swimming is at your own risk. Water shoes recommended due to the sharp volcanic rocks. Natural pools are a defining feature of El Hierro's coastline, offering safe swimming alternatives on an island with relatively few sandy beaches.