word | | Natural hazards |
| recent | Jan Mayen | dominated by the volcano Haakon VII Toppen/Beerenberg; volcanic activity resumed in 1970; the most recent eruption occurred in 1985 |
| recent | Virgin Islands | several hurricanes in recent years; frequent and severe droughts and floods; occasional earthquakes |
| reclaimed | Belgium | flooding is a threat along rivers and in areas of reclaimed coastal land, protected from the sea by concrete dikes |
| recurring | Brazil | recurring droughts in northeast; floods and occasional frost in south |
| recurring | Burkina Faso | recurring droughts |
| recurring | Kenya | recurring drought; flooding during rainy seasons |
| recurring | Mali | hot, dust-laden harmattan haze common during dry seasons; recurring droughts; occasional Niger River flooding |
| recurring | Niger | recurring droughts |
| recurring | Somalia | recurring droughts; frequent dust storms over eastern plains in summer; floods during rainy season |
| recurring | Zimbabwe | recurring droughts; floods and severe storms are rare |
| reef | Christmas Island | the narrow fringing reef surrounding the island can be a maritime hazard |
| reef | United States Pacific Island Wildlife Refuges | Baker, Howland, and Jarvis Islands: the narrow fringing reef surrounding the island can be a maritime hazard Kingman Reef: wet or awash most of the time, maximum elevation of less than 2 ... |
| reefs | Ashmore and Cartier Islands | surrounded by shoals and reefs that can pose maritime hazards |
| reefs | French Southern and Antarctic Lands | ... to periodic cyclones; Bassas da India is a maritime hazard since it is under water for a period of three hours prior to and following the high tide and surrounded by reefs |
| reefs | Mauritius | cyclones (November to April); almost completely surrounded by reefs that may pose maritime hazards |
| reefs | Spratly Islands | typhoons; numerous reefs and shoals pose a serious maritime hazard |
| referred | Pacific Ocean | surrounded by a zone of violent volcanic and earthquake activity sometimes referred to as the "Pacific Ring of Fire"; subject to tropical cyclones (typhoons) in southeast and east Asia from May to ... |
| region | Solomon Islands | typhoons, but rarely destructive; geologically active region with frequent earthquakes, tremors, and volcanic activity; tsunamis |
| region | Southern Ocean | ... glacial deposits varying widely over short distances; high winds and large waves much of the year; ship icing, especially May-October; most of region is remote from sources of search and rescue |
| regional | Italy | regional risks include landslides, mudflows, avalanches, earthquakes, volcanic eruptions, flooding; land subsidence in Venice |
| relatively | Guam | frequent squalls during rainy season; relatively rare, but potentially very destructive typhoons (June - December) |
| releases | Cameroon | volcanic activity with periodic releases of poisonous gases from Lake Nyos and Lake Monoun volcanoes |
| remote | Southern Ocean | ... glacial deposits varying widely over short distances; high winds and large waves much of the year; ship icing, especially May-October; most of region is remote from sources of search and rescue |
| Republic | Rwanda | periodic droughts; the volcanic Virunga mountains are in the northwest along the border with Democratic Republic of the Congo |
| rescue | Southern Ocean | ... glacial deposits varying widely over short distances; high winds and large waves much of the year; ship icing, especially May-October; most of region is remote from sources of search and rescue |
| restricting | Western Sahara | hot, dry, dust/sand-laden sirocco wind can occur during winter and spring; widespread harmattan haze exists 60% of time, often severely restricting visibility |
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