The forest was in Del Norte County, the northwestern tip of California; also Humboldt County. Many people wrongly think it was filmed in Muir Woods, Marin County (close to ILM), which the filmmakers initially requested, but were rejected mainly due to the pyrotechnics.
The Del Norte forest was clear-cut right after the film shoot was over, except you can visit the grove where the speeder chase scene was shot. Protected in perpetuity within a state park in Humboldt County are the remaining shreds of Endor. The Film Commission highlighted the area in its “Map of the Movies” for a self-guided tour through the two northern counties. [https://hdnfc.org/sites/default/files/2021-06/map-of-the-mov...]