The Balicuatro Islands are a group of 18 small islands situated about 11 kilometres (6.8 mi) northeast of Balicuatro Point, the northwestern tip of Samar island.
It is divided into two subgroups by the Biri Channel, with the main island of Biri on the west composed of 7 islands, and the group of Cabauan Grande (Cabaongon) on the east.
The islands border the San Bernardino Strait and Philippine Sea and are separated from Samar by the Bani Channel.

Biri is the largest and northernmost of the Balicuatro Islands and is about 6.4 kilometres (4.0 mi) long northwest and southeast and 3.2 kilometres (2.0 mi) wide.
It is generally high with a 200-foot (61 m) rocky perpendicular bluff on its northwestern side.
Its coastline is covered with mangroves and has gravel beaches on its western side.
It is surrounded by Macarite, Cagnipa, Talisay, Magesang and other smaller unnamed islands and is protected by fringing reefs.
In 2000, the island municipality had a population of 8,700 distributed in 8 barangays.

The island's main attraction is its seven gigantic rock formations, namely Magasang, Magsapad, Macadlaw, Puhunan, Bel-at, Caranas and Pinanahawan.
These rock formations are a result of underwater tectonic plate movements and crashing waves over millions of years.
Another unique feature of the island are the natural saltwater pools at Bel-at and Caranas where visitors can enjoy swimming in clear water.
To the south of Biri Channel along the coast of Lavezares are San Juan, Bani and Maravilla islands where several other white sand beaches can be found.
On the coast of San Jose and Rosario are the islands of Cabaongon, Gilbert and the rest of the subgroup.
The Balicuatro Islands are a group of 18 small islands situated about 11 kilometres (6.8 mi) northeast of Balicuatro Point, the northwestern tip of Samar island. It is divided into two subgroups by the Biri Channel, with the main island of Biri on the west composed of 7 islands, and the group of Cabauan Grande (Cabaongon) on the east. The islands border the San Bernardino Strait and Philippine Sea and are separated from Samar by the Bani Channel.
Biri is the largest and northernmost of the Balicuatro Islands and is about 6.4 kilometres (4.0 mi) long northwest and southeast and 3.2 kilometres (2.0 mi) wide. It is generally high with a 200-foot (61 m) rocky perpendicular bluff on its northwestern side. Its coastline is covered with mangroves and has gravel beaches on its western side. It is surrounded by Macarite, Cagnipa, Talisay, Magesang and other smaller unnamed islands and is protected by fringing reefs. In 2000, the island municipality had a population of 8,700 distributed in 8 barangays.
The island's main attraction is its seven gigantic rock formations, namely Magasang, Magsapad, Macadlaw, Puhunan, Bel-at, Caranas and Pinanahawan. These rock formations are a result of underwater tectonic plate movements and crashing waves over millions of years. Another unique feature of the island are the natural saltwater pools at Bel-at and Caranas where visitors can enjoy swimming in clear water. To the south of Biri Channel along the coast of Lavezares are San Juan, Bani and Maravilla islands where several other white sand beaches can be found. On the coast of San Jose and Rosario are the islands of Cabaongon, Gilbert and the rest of the subgroup.
Biri Larosa Protected Landscape and Seascape