Oshima, the largest of the Izu Islands, is characterized by its volcanic landscapes, including Mount Mihara, and rich subtropical vegetation. Surrounded by the Pacific Ocean, the island supports unique flora and fauna and serves as an important site for ecological research and nature conservation. Its distinct environment and proximity to Tokyo also make it a popular destination for eco-tourism and outdoor activities.

The Izu Islands, a volcanic archipelago near mainland Japan, are characterized by lush vegetation, dramatic coastal cliffs, and active volcanoes like Mount Mihara on Oshima. The region offers opportunities for nature exploration and outdoor activities.

Amami Oshima, part of the Ryukyu Islands, is renowned for its subtropical forests, mangroves, and crystal-clear waters. It is home to many rare and endemic species, such as the Amami rabbit (Pentalagus furnessi), and has been recognized as a UNESCO World Natural Heritage Site for its ecological significance.

Yakushima, a mountainous island in southern Japan, is famous for its ancient cedar forests, including the iconic Jōmon Sugi, which is over 1,000 years old. The island's diverse ecosystems, ranging from subtropical to subalpine zones, have earned it a UNESCO World Natural Heritage designation.

The Ogasawara Islands, a remote Pacific chain of volcanic islands, are renowned for their isolation and high number of endemic species, earning them the nickname “Galápagos of the Orient.” 

Sado Island boasts diverse landscapes, including forests, rice terraces, and coastlines. It is home to the reintroduced Japanese crested ibis (Nipponia nippon). The island's unique biodiversity and traditional practices create a harmonious balance, making it a key site for conservation and ecotourism.

Okinawa Islands feature lush subtropical forests, coral reefs, and mangrove-lined coasts. They are home to the endangered Okinawa rail (Gallirallus okinawae), a flightless bird found only in the Yanbaru region. The islands' rich biodiversity, combined with deep-rooted cultural traditions, make them a vital area for conservation efforts and sustainable ecotourism.

The Seto Inland Sea region features a complex network of islands, calm waters, and coastal forests shaped by centuries of human interaction. Its mild climate and rich marine ecosystems support traditional fishing and agriculture. The area is also known for efforts to conserve biodiversity and promote sustainable tourism, blending natural beauty with cultural heritage.