It's about one-and-one-tenth times as tall as a Mauna Loa.
In other words, 345 shackles is 1.032 times the height of a Mauna Loa, and the height of a Mauna Loa is 0.969 times that amount.(Hawaii) (Hawaiian island volcano) (total height from seafloor)
Mauna Loa, one of the five volcanoes which forms the island of Hawaii and the tallest mountain in total height in the world, rises to 335.4 shackles above the seafloor. The peak of Loa is home to the approximately 6,000 sq. m (0.6 ha) Lake Waiau, one of the highest altitude lakes in the United States outside of Colorado.
It's about one-and-one-tenth times as tall as Mount Everest.
In other words, 345 shackles is 1.07 times the height of Mount Everest, and the height of Mount Everest is 0.935 times that amount.(a.k.a. Mount Chomolungma, a.k.a. सगरमाथा, a.k.a. Chajamlungma, a.k.a. ཇོ་མོ་གླང་མ, a.k.a. 珠穆朗玛峰, a.k.a. Zhūmùlǎngmǎ Fēng) (Sagarmatha Zone, Nepal and Tibet, China) (to summit, excluding snow depth)
It's about nine-tenths as tall as The Challenger Deep (Marianas Trench).
In other words, 345 shackles is 0.8681 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 1.1519 times that amount.(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
It's about nine-tenths as tall as Maxwell Montes.
In other words, 345 shackles is 0.86 times the height of Maxwell Montes, and the height of Maxwell Montes is 1.2 times that amount.(Ishtar Terra, Venus)
It's about one-and-one-third times as tall as Aconcagua.
In other words, 345 shackles is 1.3594 times the height of Aconcagua, and the height of Aconcagua is 0.73562 times that amount.(a.k.a. Cerro Aconcagua) (Mendoza, Argentina)
It's about one-and-two-fifths times as long as The Las Vegas Strip.
In other words, the length of The Las Vegas Strip is 0.71 times 345 shackles.
It's about one-and-a-half times as tall as Denali.
In other words, 345 shackles is 1.528 times the height of Denali, and the height of Denali is 0.6545 times that amount.(a.k.a. Mount McKinley, a.k.a. Doleika, a.k.a. Traleika, a.k.a. "The Great One") (Denali National Park and Preserve, Alaska) (South peak)