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Get InspiredOceaniaNorthern Mariana IslandsSaipanI MaddokThe Grotto

The Grotto

MP
Tourist Attraction·Awe Inspiring, Dramatic, Physical
The Grotto
Photo by 쩡이 from Google Places
The Grotto
Photo by 맨블 MANVEL from Google Places
The Grotto
Photo by Daramchad Mena from Google Places
The Grotto
Photo by 박성백 (diver_back) from Google Places
The Grotto
Photo by Youngsuk Kim from Google Places
The Grotto
Photo by 쩡이 from Google Places
The Grotto
Photo by 맨블 MANVEL from Google Places
The Grotto
Photo by Daramchad Mena from Google Places
The Grotto
Photo by 박성백 (diver_back) from Google Places
The Grotto
Photo by Youngsuk Kim from Google Places

The Grotto is Saipan's most iconic natural attraction, a collapsed limestone cavern that connects to the open ocean through underwater tunnels. Located in I Maddok, this site is famous for its ethereal blue light and crystal-clear visibility, making it a bucket-list destination for divers and snorkelers alike. Visitors descend a steep staircase of over 100 steps to reach the water's edge, where the sheer scale of the cave—often compared to a massive cathedral—becomes apparent. While the trek back up can be strenuous, the opportunity to swim in such a dramatic, light-filled cavern is widely considered a highlight of any trip to the Northern Mariana Islands.

The Grotto is Saipan's most iconic natural attraction, a collapsed limestone cavern that connects to the open ocean through underwater tunnels. Located in I Maddok, this site is famous for its ethereal blue light and crystal-clear visibility, making it a bucket-list destination for divers and snorkelers alike. Visitors descend a steep staircase of over 100 steps to reach the water's edge, where the sheer scale of the cave—often compared to a massive cathedral—becomes apparent. While the trek back up can be strenuous, the opportunity to swim in such a dramatic, light-filled cavern is widely considered a highlight of any trip to the Northern Mariana Islands.

You might want to ask

Address
7R6F+5FH, Grotto Dr,I Maddok, Saipan 96950, CNMI
Phone1833-9881
Hours
Closed
Daily 8:00 AM - 5:00 PM

Highlights

  • Crystal-clear deep blue water inside a massive limestone cavern.

  • Unique underwater karst cave reaching depths of 70 feet.

  • Dramatic cliffside scenery and a cathedral-like atmosphere.

  • Popular spot for both guided snorkeling and professional diving.

Best For

Snorkeling, diving, and witnessing dramatic natural cave formations.

Occasion Tags

Tourists, Groups

Reviews

4.6
Excellent1,2 K reviews

The Grotto is widely celebrated as a breathtaking natural wonder and a must-visit destination in Saipan. Reviewers are consistently mesmerized by the crystal-clear, deep blue water and the dramatic scale of the limestone cave, which some compare to a massive cathedral. While the scenery is stunning, many visitors highlight the physical challenge of the 117 steep, narrow stairs required to access the water. Most recommend visiting as part of a guided tour, especially for snorkeling, as guides provide essential assistance with water entry and exit. The site is noted for being well-maintained, though it can get crowded with tour groups. Overall, it is described as an awe-inspiring experience for both divers and casual swimmers, provided they are prepared for the hike back up.

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Location

I Maddok, Saipan, Northern Mariana Islands