Type the first three letter of one country followed by the first three of the other one (eg type ITA-GER or GER-ITA if you think there's a border between Italy and Germany). If you think a country has no borders, type its first 3 letters followed by 'NOB' (eg POR-NOB if you think Portugal has no borders)
In brackets you are shown the length of the border, in km
You may type 'UK' instead of 'UNI' for United Kingdom