I watched it as a kid in the early 90's but the style was a bit older. It was on VHS.
The title was something like: Ray/Rei the hero? of the jungle? but it was a dubbed version so I'm not sure. The protagonist is Ray? a young man. He has black hair and wears yellow furs. I don't remember the plot but he travels with his friends in a prehistoric world.
I remember two scenes:
Somewhere in the middle of the movie - they are on a raft on a lake and under them is a ginormous dinosaur. I guess it emerges from the water causing them to ride the wave and scream.
Towards the very end - there is a village where a volcano is about to erupt so they want to sacrifice a girl to it: that would be the friend of the protagonist and the granddaughter of the old woman who wants to sacrifice her.
Beware Spoilers!
Volcano erupts, girl gets killed somehow I think in a fight, someone lays the girl down on the ground with the volcano with flowing lava in the background, old woman is praying to the volcano. And my friend's mom turned off the TV saying "you shouldn't watch films like this" (well, too late) and I never knew the end.
The old woman had long white hair & purple robes?, girl had long brown hair.
Please tell me what this is, I cannot find it anywhere.