help me find this anime /2000s

my memory is so hazy because I watched it a long time ago i remember some scenes. there was a forest these group of people teens I think were looking for smth on an adventure ig? they get attacked by a swarm of bugs or something. there was another scene in a cave the ground was all water shallow water you can walk on and there was a naked girl above the water hanging on either vines or some fabric drapery not sure. this anime didn't look dark it looked like a 2000s movie maybe