Iceland and a few other islands definitely look like the best candidates. I would argue that six of Tuvalu's nine islands are reasonably clear cases. The curre

Iceland and a few other islands definitely look like the best candidates. I would argue that six of Tuvalu's nine islands are reasonably clear cases. The current Polynesia inhabitants have a direct line of ownership back to the first arrivals. Tuvalu was a British protectorate and then crown colony, but it remained comparatively independent until actual self-rule - and as far as I can tell, British colonial administrators never extended beyond the islands of Funafuti, Nanumea and Nukufetau, nor did American soldiers in WWII. The remaining six inhabited islands appear to have been consistently controlled by the first people ever to settle there. If we discount strictly paper claims of ownership, the number may go up - some remote regions of some mainland indigenous land don't seem to have ever been meaningfully contested. In North America, some parts of Nunavut or non-coastal Alaska are the most obvious options. More surprisingly, the White Mountain Apache appear to have held some land from continuously from European arrival to the present Fort Apache Reservation. The pre-European history of the region is somewhat less clear, but it appears that the Mogollon residents of the area abandoned it during a drought around 1400, before the Western Apache moved into the empty region. If so, that represents continuous ownership for around 500 years with no initial conquest.