Small Cairn Erected As Trail Marker On Highlands Royalty-Free Stock Photo

Close-up of small cairn, a human-made rock pile erected as trail marker or landmark on highlands at the Serra da Estrela. The highest mountain range in continental Portugal, with astonishing scenery europe beiras vacation travel tourist countryside rustic bush lawn tranquility ground grass flinty sunny terrain stone moss lichens wilderness clump shrub leafage stack handmade path trek cross-country route pointer indicate orientation weathered gravel rubble rough granite heap guidance limestone bunch asymmetric dirt