Nature

In northern Switzerland, you can take a boat to the base of Rheinfall, the largest waterfall in Europe, and climb the stairs on the pinnacle of rock at its center. Including the climb, a ride lasts about 30 minutes.

ITN asked subscribers to each send in two lists of international destinations, excluding locations in Europe (which is so popular among travelers) and in the United States (which ITN does not cover).

Mt. Sinabung, on the Indonesian island of Sumatra, erupted on Feb. 19, spewing ash more than 3 miles into the air and causing a massive pyroclastic flow. No injuries were reported, but nearby towns were evacuated during the eruption. Worldwide, it was the largest volcanic eruption in the last five years.

Mt. Sinabung erupted in 2010, killing two people, after centuries of dormancy. It has erupted two other times since then, in 2014 and 2016, killing a total of 23 people. The area immediately around the base of the volcano is now off limits due to its continued activity.

14-day, 13-night expedition in ETHIOPIA. Departures Nov. 2018-March 2019. Group size, 4-11. Highlights: Jeep from Addis Ababa into Great Rift Valley/Awash National Park safari/at Afrera Lake, night swim in hydrothermal springs/colorful hot springs in Dallol crater/Afar villages/in Erta Ale caldera, explore lava fields and fumaroles/Lalibela. $4,950 ppdo. Single supp., $245. VolcanoAdventures (Heideweg 2, 66606 St. Wendel, GERMANY; tours@volcanodiscovery.com, www.volcanoadventures.com).

12-day, 11-night bus trip, Nov. 12-23, 2018. “Easy to moderate walking.” Highlights: From Tel Aviv, drive to birding sites along coast/Hula Nature Reserve, home to golden jackals, wild boars/Hula Agamon Park, home to cranes, eagles/Mount Hermon/Beit She’an Valley, home to black storks/Jerusalem Bird Observatory/Ein Gedi Reserve/Eilat Bird-Watching Park. $4,425 (12-15 people) or $4,675 (less than 12) ppdo. Single supp., $735. Sierra Club (Oakland, CA; 415/977-5522, www.sc.org/adventure-travel).

Ash emissions from Mount Agung in Bali, Indonesia, caused the evacuation of more than 100,000 people from an area within 6 miles of the volcano on Nov. 27 as vulcanologists warned that a major eruption could occur at any time. 

Flights were canceled at nearby Ngurah Rai International Airport (DPS) until Nov. 29, stranding tourists on the island. Another airport, on the neighboring island of Lombok, was also briefly closed. Ash eruptions were continuing as of press time, with airport operations to be determined based on the direction of the ash cloud.

• More than 42,000 people were evacuated from the area around the Mount Agung volcano in eastern Bali, Indonesia, as geologists feared it was about to erupt. Authorities issued a 7½-mile-wide “exclusion zone” around the mountain. Signs of an impending eruption included regular tremors, indications of rising magma and a column of smoke that ascended from the mountain on Sept. 24.

Mount Agung last erupted on the island in 1963, when it killed more than 1,000 people.

15 days, 14 nights. Highlights: San José/in Tortuguero National Park, Sea Turtle Museum, boat trip to see monkeys, caimans, birds/Arenal Volcano/Monteverde and Santa Elena cloud forest reserves/Manuel Antonio National Park, home to monkeys, sloths, iguanas/in village of Copey, school visit, lunch with local family. $3,025-$3,535 ppdo (per dates). Single supp., $798-$884. Exodus Travels (112 Merton St., Toronto, ON, M4S 2Z8, Canada; in US, 844/227-9087, www.exodus
travels.com).