Choosing a random item from one of two lists, based on a random item from a third

I am trying to select a random city of a random country, using the following code:

COUNTRIES= ["NL", "NO"]

NL = [
    "Assen", "Almere", "Leeuwarden", "Nijmegen", "Groningen", 
    "Maastricht", "Eindhoven", "Amsterdam", "Enschede", "Utrecht", 
    "Middelburg", "Rotterdam"
]

NO = [
    "Fredrikstad", "Baerum", "Oslo", "Ringsaker", "Gjovik", 
    "Drammen", "Sandefjord", "Skien", "Arendal", "Kristiansand", 
    "Stavanger", "Bergen", "Forde", "Alesund", "Trondheim", 
    "Stjordal", "Bodo", "Tromso", "Alta"
]

CHOSEN_CITY = random.choice(random.choice(COUNTRIES))

print CHOSEN_CITY

However, this only ever gives me one of 'L', 'O' or N. What am I doing wrong here?