claim: South Island is separated from North Island by the Gibraltar Strait.
evidence: The Battle of Zawichost -LRB- 1205 -RRB- was a battle fought between Roman the Great of Galicia-Volhynia and Leszek I the White of Lesser Poland , along with his brother , Konrad I of Masovia .. Zawichost. Zawichost. Poland. Poland. Lesser Poland. Lesser Poland. Galicia-Volhynia. Galicia-Volhynia. Leszek I the White. Leszek I the White. Konrad I of Masovia. Konrad I of Masovia. Roman the Great. Roman the Great. After declaring war and invading Lesser Poland , Roman and his forces -LRB- druzhina -RRB- were ambushed by the Poles in the vicinity of Zawichost by the Vistula -LRB- Visla -RRB- River .. Zawichost. Zawichost. Poland. Poland. Lesser Poland. Lesser Poland. druzhina. druzhina. Vistula. Vistula. In the tumult that followed , Roman was killed and the Polish victory would lead to Poland 's growing power and the weakening of Rus ' .. Poland. Poland