There seems to be an implied range limit to Apparation. In Book 7, Voldemort travels to Germany, to Nurmengard Prison, to see Grindelwald. While there, he's called by Lucius and Bellatrix to Malfoy Manor, and he has to fly for a significant distance before he is "close enough" to Apparate directly to the Manor.
However, it's unclear exactly what the range limit of Apparition is. It appears that you can pretty much go anywhere on the British Isles in one jump, but somewhere between London and Berlin you'd have to make an intermediate stop (or like Voldemort, simply fly until you're in range). Other methods of travel, such as Portkeys, have much longer ranges; The Salem Witches' Association probably used a Portkey to get from Massachussetts to Britain for the World Cup in Book 4, as there's not much in between and anyone of any age can use a Portkey once it's been set up.