Lava tube

A lava tube, more rarely called a pyroduct or lava tunnel, is a natural roofed conduit along which molten lava flows from a volcanic vent. If lava in the tube drains out, it will leave an empty cave. Lava tubes are common in low-viscosity volcanic systems.

Lava tubes transport molten lava much further away from the eruptive vent than lava channels.
A tube-forming lava flow can emplace on longer distance due to the presence of a solid crust protecting the molten lava from atmospheric cooling.
Lava tubes are often considered when preparing hazard maps or managing an eruptive crisis.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 2.5

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