An exclusion zone, encompassing the southern half of the island to as far north as parts of the Belham Valley, was imposed because of the size of the existing volcanic dome and the resulting potential for pyroclastic activity. Visitors are generally not permitted entry into the exclusion zone, but a view of the destruction of Plymouth can be seen from the top of Garibaldi Hill in Isles Bay. Relatively quiet since early 2010, the volcano continues to be closely monitored by the Montserrat Volcano Observatory.