Plizio Visual Lab

Bravo Crater

Plizio editorial teamUpdated: Jun 2026Data Sources

Landmark

Weather…

Bravo Crater is a stark and haunting geographical scar located on the northwestern corner of Bikini Atoll. It was formed on March 1, 1954, by the detonation of Castle Bravo, the most powerful thermonuclear device ever tested by the United States. The explosion yielded 15 megatons, two and a half times more than predicted, resulting in the instantaneous vaporization of three coral islands and a massive section of the reef. The resulting crater measures roughly 2 kilometers (1.2 miles) in diameter and reaches a depth of 75 meters (250 feet). The fallout from the blast was far more widespread than anticipated, contaminating nearby inhabited atolls such as Rongelap and Utirik, which led to a global outcry and significant changes in nuclear testing protocols. Today, the crater is part of the Bikini Atoll UNESCO World Heritage site, recognized as a profound symbol of the nuclear age. From the air, it remains clearly visible as a deep indigo circle against the lively turquoise waters of the lagoon.

Location: Marshall Islands
Top sights: Castle Bravo · Castle Romeo

Best time to visit & climate

The most pleasant time to visit is Jan–Mar.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg °C	27	27	27	28	28	28	28	28	28	28	28	28
Rain mm	26	26	34	60	63	65	112	138	147	169	113	45

📋 Practical info

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Visiting

The Bravo Crater on Bikini Atoll is a historical witness to the largest US nuclear test. The crater can only be visited as part of guided tours organized from Majuro.

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Typical hours

There are no regular visiting hours; tours are arranged by appointment with strict conditions. The best time to visit is during the dry season from December to April.

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Photography

Photography is usually allowed on tours, but certain angles may be restricted for safety. The sight of the massive crater is an impressive photo subject.

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Time needed

Viewing the crater is part of a longer atoll tour that often takes a full day. Expect at least 4-6 hours on the water.

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Combine with

Combine viewing the crater with a visit to Bikini Atoll and other nuclear test sites. The Alele Museum in Majuro provides further information.

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Getting there

The Bravo Crater is on Bikini Atoll, reachable only by boat or plane from Majuro. All tours include transportation and a licensed guide.

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Insider tip

Thoroughly inform yourself about radiation levels beforehand - the area is not fully decontaminated. Strictly follow the guide's instructions and stay on designated paths.