Arreton Down Nature Reserve | Hampshire and Isle of Wight Wildlife TrustEnjoy magnificent views over the Eastern Yar Valley in this exceptionally rich chalk grassland reserve, brimming with a huge variety of plants and insects.Enjoy magnificent views over the Eastern Yar Valley in this exceptionally rich chalk grassland reserve, brimming with a huge variety of plants and insects. Arreton Down comes to life in summer when tens of thousands of chalkhill blue butterfly are on https://www.hiwwt.org.uk/reserves/arreton-down