[5] A little to the east of Fjallkirkja is the hut of the Icelandic Glacier Research Society (also called Jöklarannsóknarfélag in the Jöklarannsóknafélag Íslands [is]), which includes scientists as well as interested amateurs.

However research has shown that large quantities of water flow in sub-surface streams to lake Þingvallavatn (some 50 km (31 mi) to the south and easily accessible to tourists) and reappear in springs in and around the lake, while the same happens on the west side, giving rise to various tributaries of the Hvítá River as well as some rivers flowing north towards Húnaflói.

Thus many of the hot springs in the Borgarfjörður region (near the estuary of the Hvítá on the west coast), such as Deildartunguhver, receive ground water from Langjökull.

About 1,000 years ago, the craters of this system produced the lava field Hallmundarhraun [ˈhatl̥ˌmʏntar̥ˌr̥œyːn] which extends some 50 km (31 mi) westward into the valley of the Hvítá, and is traversed by underground streams which emerge at the waterfalls of Hraunfossar not far from Húsafell.

Another volcanic system to the south-west of Langjökull is Presthnúkur, named after its central volcano, a rhyolite dome with a high temperature area at its foot.

With its easily accessible location in the Icelandic interior, Langjökull provides opportunities for various activities, such as glacier hiking, snowmobiling, monster truck ride, and exploring natural ice caves and man-made tunnels.

Located near popular tourist routes like the Golden Circle, Langjökull holds a prominent position in Iceland's tourism industry.

Its significant contribution to the surrounding natural wonders, such as Gullfoss waterfall and Geysir's geothermal area, adds to its allure.

The glacier's proximity to these iconic sites makes it a sought-after destination for travelers seeking to witness the awe-inspiring effects of glacial forces on the landscape.

Visitors are encouraged to respect the environment and follow sustainable guidelines to ensure the long-term preservation of this remarkable glacier.