It's a river going through a bed of volcanic ash. There are even more stunning pictures like it.
Source: thisiscolossal.com
Source: thisiscolossal.com
Source: thisiscolossal.com
Source: thisiscolossal.com
It's a river going through a bed of volcanic ash. There are even more stunning pictures like it.
Source: thisiscolossal.com
Source: thisiscolossal.com
Source: thisiscolossal.com
Source: thisiscolossal.com