Herlandsnesjane, a four-kilometre long peninsula in Lake Storavatnet in the middle of Osterøy, is well known among botanists. Here lies an unusually large and diverse bog.
On June 2nd, 1992, a big forest fire broke out in Sveio. The fire started southeast of Hopsfjellet. In a strong wind the flames spread quickly northward. Houses on the other side of the highway were threatened, but escaped unscathed. The burned area, which is easily visible about a 5 minute's drive south from the tunnel at the triple- junction, was made into a nature reserve in 1998. The intention was to ensure that the re-establishment of plant- and animal life would take place without disturbance.