Hotel Grand Mer Sankaiso is operated by a locally owned hospitality company with many years of experience in managing hot spring resorts in Ajigasawa, Aomori. For decades, we have welcomed guests from Japan and around the world with warm Japanese hospitality and attentive service. Our team is dedicated to creating a comfortable and relaxing stay so that every guest can feel at home while enjoying the beauty of northern Japan.

Hotel Grand Mer Sankaiso is an all-inclusive hot spring resort located in Ajigasawa Onsen, surrounded by the Sea of Japan and the beautiful mountains of Aomori. Our hotel features natural hot spring baths filled with rare fossil seawater, rich in minerals and known for their relaxing and soothing effects. Guests can unwind in open-air baths while enjoying spectacular ocean views and sunsets. Enjoy colorful buffet meals made with fresh local seafood and seasonal ingredients from Aomori, along with drinks and light snacks included during dinner and in the lounge. With our all-inclusive style, you can relax without worrying about extra charges. We also offer Japanese-style tatami rooms and comfortable samue robes, allowing you to experience the traditional atmosphere of a Japanese ryokan stay. Combining hot springs, local cuisine, and beautiful scenery, Hotel Grand Mer Sankaiso is the perfect place to relax and explore northern Japan.

Surrounded by the Sea of Japan and the beautiful Shirakami Mountains (a UNESCO World Natural Heritage site), Ajigasawa is an ideal destination for enjoying Aomori’s rich nature and outdoor activities throughout the year. Just 2 minutes by car from the hotel, you can visit the popular local squid stand “Kikuya Shoten.” In winter, Aomori Spring Ski Resort is about 20 minutes away by car, and a shuttle service for skiers is available with advance reservation, making the hotel a convenient base for winter sports. Nearby attractions include the mystical Aoike Blue Pond in the Shirakami Mountains, the spectacular Tsuru-no-Mai Bridge — Japan’s longest wooden triple-arched bridge — and Takayama Inari Shrine with hundreds of red torii gates. Guests can also enjoy seasonal apple picking at Hirosaki Apple Park. With easy access to both natural and cultural highlights, Hotel Grand Mer Sankaiso is the perfect base for sightseeing, scenic drives, and seasonal adventures in Aomori.