At the upstream of the Porvoo River in Hollola, where the river is called Luhdanjoki, the Finnish Natural Heritage Foundation purchased an area made up of four parcels in the summer of 2019. The area was sold to the foundation by the Enskala company, in whose possession the area had remained more or less untouched. In November 2019, the protection of the river banks received additional support when the heirs sold an extra parcel of land to the Finnish Natural Heritage Foundation, this time from the southern section of Luhdanniitty, where aspens appear in particularly large quantities together with decayed wood, and the shores of this section also has considerably more soil not affected by the floods. The pearl necklace of the conservation areas around the Luhdanjoki river had once again received a new green pearl in the chain – the Luhdanniitty area now has an area of over eight hectares.

Luhdanniitty is located at the end of a small road about a kilometre away from Luhtaranta, an area previously protected by the foundation on the opposite shore. There is a private conservation area left south of this place, and a few kilometres away in the north, we find the fairly large Luhdanjoki conservation area with its bird watching towers. If the protected eight hectares of Luhtaranta are taken into consideration, the Finnish Natural Heritage Foundation has protected over 16 hectares at the upstream of the Porvoo River.

Luhdanniitty contains flood-meadows, which are valuable habitats that offer good nutritional plants for butterflies, among others. The common snipes make drumming noise over the shores, the green sandpipers fly away, and the bird flocks pause for a while by the waters. Some of them nest by the river – the Luhdanjoki area is an important nesting site for water birds.

It is known that there was an ancient lake in these regions at the beginning of the Common Era, and there are several living environments and camps that date back to the Mesolithic period of the Stone Age to be found on its shores. The ancient lake disappeared by natural causes, but its shape still appears from the major lines of the terrain, the meandering Luhdanjoki river being a watery memory of its existence. When the water level went down, the shores were used as pasture lands, and people have made hay there.