(5)Criteria should be provided to further specify geographical diversification. In order to ensure sufficient geographical diversification, the Board should make use of readily available criteria, namely the principles referred to in Article 77 of Regulation (EU) No 806/2014, which imply the calculation of the shares of contributions of institutions established in each participating Member State. Given that those shares are based on the size of the contributing credit institutions and investment firms, and adjusted to their risk profile, they will be positively correlated with the size and depth of the corresponding financial markets. Since other considerations may warrant additional investments in a given participating Member State, a buffer should be introduced to allow further margin of appreciation by the Board, while ensuring minimum diversification across a sufficient number of participating Member States. In addition, since those shares may not be calculated for investments in non-participating Member States or third countries, they should be subject to limits to be set by the Board proportionally to those for participating Member States, on the basis of the similarities between countries.