Eruption and lava flow from the Monti Calcarazzi fissure on the southern flank of Mt Etna in 2001, the flow threatened the town of Nicolosi below, Mt Etna, Sicily, Italy

Eruption and lava flow from the Monti Calcarazzi fissure on the southern flank of Mt Etna in 2001, This flow threatened the town of Nicolosi, Sicily, Italy

Mineral stained pond on collapsed flank of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

The west flank of 6310m Volcan Chimborazo, with its unique type of Andean high paramo (puna) made dry by the rain shadow, Chimborazo Province, Central Highlands, Ecuador, South America

Colourful autumn trees flank the River Merced in Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America

Hikers watch a condor (Vultur gryphus), Ferrier Vista Point, eastern flank of Pingo Valley, Torres del Paine National Park, Patagonia, Chile, South America

Showa Shin-zan lava dome, that grew from nothing in 1945, on flank of Usu volcano, Shikotsu-Toya National Park, Hokkaido, Japan

Autumn trees flank the River Merced in Yosemite Valley, California, United States of America, North America

Mountains flank a frozen lake in Mosstrond, near the Hardanger Plateau, Norway, Scandinavia, Europe

Lava flow from the Monti Calcarazzi fissure that threatened Nicolosi on the south flank of Mt. Etna, Sicily, Italy, EuropeThe Piano del Lago cone (above) destroyed the Sapienza cable car.

Sulphurous fumaroles and volcanic strata in Tompaluan active crater on the flank of Mount Lokon, a volcano near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia Indonesia

The peak of Mount Lokon, a stratovolcano with Tompaluan active crater on its flank, near Tomohon city, Gunung Lokon, Tomohon, North Sulawesi, Indonesia, Southeast Asia, Asia

The 3350m snow-capped volcano Mount Etna, UNESCO World Heritage Site, looms over the Maletto town on its western flank, Maletto, Catania Province, Sicily, Italy, Europe

Lava flow from the Monti Calcarazzi fissure that threatened Nicolosi on the south flank of Mount Etna in 2001, the Piano del Lago cone destroyed the Sapienza cable car, Sicily, Italy, Europe

Lava flow from the Monti Calcarazzi fissure on the flank of Mount Etna in 2001 which threatened Nicolosi below, Sicily, Italy, Europe

Wategos beach, a popular surf break on the northern flank of Cape Byron near Byron Bay, New South Wales (NSW), Australia, Pacific

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, Big Island, Hawaii, Hawaiian Islands, United States of America, North America

Lava flow from the Piano del Lago cone destroying the cable car above Rifugio Sapienza on the south flank of Mount Etna during the 2001 eruptions, Sicily, Italy, Europe

Durbar Square before dawn, lion statues flank steps to Jagan Naryan Mandir, UNESCO World Heritage Site, Patan, Kathmandu valley, Nepal, Asia

Lava flow from the Monti Calcarazzi fissure on the southern flank of Mount Etna in 2001, threatening the town of Nicolosi below, Sicily, Italy, Europe

On the flank of Mount Workamba, Tambien region, Tigre Province, Ethiopia, Africa

New eruptive cone on the flank of Volcan Lonquimay, Araucania region, Chile, South America

Sei Whale Dorsal fin and flank showing cookie cutter shark bites

False-killer whale (Pseudorca crassidens) surfacing off Isla San Esteban in the midriff region of the Gulf of California (Sea of Cortez), Mexico

Pilot whale (globicephala macrorynchus) A pilot whale with scars on the flank. Canary Islands

Mark gazing at a target, M22, in the Milky Way with his TeleVue 127 refractor at the annual Rothney Observatory Milky Way Nights for July 25, 2019. Several satellite trails mark the sky. Jupiter (brightest at right) and Saturn (at left) flank the Milky Way.

A horizon-to-zenith panorama of the winter consellations on a March evening as they set into the southwest. Orion is at bottom centre, with his Belt pointing down to Canis Major and up to Taurus. Gemini and Auriga are at top, in this case near the zenith overhead. The bright star clusters, M44, the Beehive, (at left) and M45, the Pleiades, (at right) flank the Milky Way. M45 is embedded in the Zodiacal Light. The star clusters M35 in Gemini and M41 in Canis Major are also visible as diffuse spots, as are several other star clusters. A couple of satellite trails are visible.

Aescher tavern and panorama mountain view in the steep facing north flank of Ebenalp mountain, Appenzell, Switzerland

Aescher tavern in the steep facing north flank of Ebenalp mountain, Appenzell, Switzerland

Rainbow and clouds, flank of table volcano Heroubreio or Herdubreid, Icelandic highlands, Iceland, Europe

Mount Hood Volcano, southern flank, panorama, Cascade Range, Oregon, USA

Eastern flank of Mount Hood Volcano with the Elliot Glacier, Cloud Cap, Cascade Range, Oregon, USA

Succulent wrapped flank steak on the BBQ

Succulent wrapped flank steak on the BBQ

Succulent flank steak on the BBQ

Succulent flank steak on the BBQ

A leopard, Panthera pardus, lies in a tree, front paws flank hits head, alert, leaves in foreground, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa