The But this particular sinkhole in Oman is so stunning it has been turned into a tourist attraction. The beautiful limestone hollow, in Bimmah, boasts the kind of clear waters normally only seen on holiday postcards. While similar holes engulf residential streets or open up in front of despairing home owners, theBimmah sinkhole has long been attracting tourists eager for a picturesque swim. Visitors are regularly spotted at the Oman site taking a dip in the vibrant emerald-tinted waters of its 20m-deep pool. Sinkholes are found worldwide, and can form suddenly or over time, ranging in size from just one metre wide Source: The Coming Crisis
