id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
11669	Warning: natural type valley - Unclosed way	anonymous	team	"There is a warning, if natural=valley is a line:
""natural type valley - Unclosed way""

But according to the Wiki in most cases a valley should be mapped as a line:
https://wiki.openstreetmap.org/wiki/Tag:natural%3Dvalley
"	enhancement	closed	normal	15.08	Core validator	latest	fixed