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From the Wenja Village, if you follow the river up to the northeast portion of the map into the mountains, a cave can be found containing the skeleton of a Blood Dragon from Far Cry 3: Blood Dragon surrounded by a cluster of dragon eggs.
Contributed by MehDeletingLater
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In the valley just south of the Wenja Village, a corpse laying on the hood of a crashed makeshift car can be found at the bottom of the lake at the western end of the valley. This car is a reference to the Canopysaurus cavemobile owned by Fred Flintstone in the animated series "The Flintstones".
Contributed by MehDeletingLater
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Far Cry Primal uses an almost identical map layout to Far Cry 4. The map can't be the same area thousands of years apart, as Far Cry 4 takes place in the Himalayas while Primal is set in Central Europe.
Contributed by Mass Distraction