The phrases "in the south of" and "to the south of" are used differently to describe location, particularly in relation to geography: 1. "In the south of": This phrase refers to something that is located within the southern part of a specific area or region. Example: "I live in the south of Germany." (This means you live in the southern part of Germany.) 2. "To the south of": This phrase is used when referring to something that is located outside or beyond the southern border of a particular place. Example: "Austria is to the south of Germany." (Austria is located beyond the southern border of Germany.)

на півдні in the south of на південь від to the south of

'In the South of' is like a prepositional case usage where the place is located in the south of that particular country/location. Odesa is located in the south of Ukraine. 'To the south of' is in reference to another location. Bulgaria is located to the south of the Ukraine. Bulgaria is not in the south of Ukraine. Out of curiosity, from DeepL translator, it looks like both of these types of descriptions in Ukrainian use prepositional case (or at least, I think so, maybe 'на південь від України' here has a directional aspect?): Одеса розташована в південній частині України. Болгарія розташована на південь від України. In Russian, the distinction between the two is more analogous to English: 'located to the south of' takes the dative and then the genitive 'к югу от' and 'located in the south of' takes the prepositional case 'в.' Одеса находится в Южной Украинe. Болгария находится к югу от Украины

"In" is a preposition of place, so the meaning is clear; but you didn't give us much context to analyze the function of "to." "To" is usually a preposition of movement when it's followed by a cardinal direction, so here it could obviously be focusing on movement: "going to the south of..." "traveling to the south of...", etc. In some contexts "to" could also be focused on comparing two locations, like in "further to the south of..." or "when compared to the south of..."

在南方是表达了你现在就在南方的地理位置，然后到南方是你还没有到，但是已经在路上。