Drumstrang School

[Hagrid]

No: HPFGUIDX 154224

"Veil, ve have a castle also, not as big as this, nor as 
comfortable, I am thinking," he(Krum) was telling Hermione.  "Ve 
have just four floors, and the fires are lit only for magical 
purposes.  But ve have grounds larger even than these - though in 
vinter, ve have very little daylight, so ve are not enjoying them.  
But in summer ve are flying every day, over the lakes and the 
mountains -"
"Now, now, Viktor!"  said Karkaroff with a laugh that didn't reach 
his cold eyes, "don't go giving away anything else, now, or your 
charming friend will know exactly where to find us!" 
(GOF - Chap 23)

In the next exchange, DD hints towards the Room of Requirements. 
That did not turn out to be idle chatter in the following two books, 
so what about Drumstrang School?

Could that little description get HRH to explore Drumstrang in their 
quest for Horcruxes?

Where do you think Drumstrang is? 

- "very little daylight" during winter sounds close to the artic 
circle.
- Arriving by ship sounds not land bound
- lakes and mountains, hmmm

Some memebers know that area much better than me. Is it:
- Norway?
- Baltic nations?
- another area?