In 2024 I visited some parts of the Slovak border, especially around the tripoints with Czechia-Austria and with Austria-Hungary.
On this page I will describe three border sections.

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Czechia-Slovakia
The border between Czechia and Slovakia is a relative new border, as Czechia and Slovakia used to be one country untill 1993.
I assume the border markers are placed after this time.
For the last kilometers to the soutern tripoint with Austria the border follows the Morava river. On October 20th, 2024 I visited this tripoint. Along the river I could spot some border markers.
The border between Czechia and Slovakia appears to be split in 41 parts. The stones I could spot along the Morava all have number 40, followed by a second number and the letter S, because I am on the Slovak side of the river.
I could spot three stones in the 40/ range. At the location of stone 40/4S I only found the red/white pole.
There has been high water recently which makes it hard to find all the markers.
Also the terrain is sometimes quite hard to conquer.
The border ultimately ends at the tripoint Austria-Czechia-Slovakia. The last border marker from the Czech-Slovak border is located here. It has number 41.
There are three stones on each side of the rivers. The three stones all have three numbers:

• Number 41, the last stone of the Czech-Slovak border
• Number XI/6, the last stone of the Austrain-Czech border.
• Number I, the first stone of the Austrian-Slovak border (see below)

The tripoint is a "wet" tripoint, it is in the middle in the river and you can't go there without a boat. The Czech side looks the most intetesting, but is also the hardest to reach. I only visited the Slovak side.

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Austria-Slovakia

The stones on the tripoint count as stone "I" as the marker for the Austria-Slovakia border.
I followed the river forming the border here for about 2 kilometers.
I found small stones with a red and white pole next to it, and assumed these were border markers.
They are not in equal distances from each other so river markers seemed unlikely.
However, the numbers on the poles count in the other direction than expected, starting with 458 numbering backwards.
This is not in line with the expected numbers, so I am in doubt if these stones are actually border markers.
I will post them anyway. The stones are usually inside cemented holes and were sometimes burried below clay, due to the recent high water.

Once this was the iron curtain, nowadays a bridge you can freely cross, although there is a mobile border post on the Austrian side.
The traces of the high water can be clearly seen here as well. The Austrian-Slovak border ends at the tripoint with Hungary. I visited it the same day, October 20th, 2024, coming from the other side.
It was not allowed to enter the area because of bird protection. This was fine for me, I was happy with only the very last marker as well. This marker has the number IV/148. Therefore I assume the border between Austria and Slovakia is split up in four sections.

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Hungary-Slovakia

The first border marker is located at the tripoint with Austria. It has number I. 1x
The markers have a S on the Slovak side and a M on the Hungarian side.
I followed the border from the tripoint about 2,5 kilometers. The numbers are quite complicated, as the next stones have numbers (I.) 1/1x and 1/2x. Next up are 1/3x and then marker 1/3ax
The numbers continue like this, while the border is zigzagging a bit, although the paths on both sides continue straight. After 1/4bx marker 2x can be found.
This if followed by 2/1x and so on. After 2/2bx I am leaving the comfortable path and continue via a bridge over the highway. This road is not being used and only connects the parking lots on both sides of the highway and border with each other.
I did not notice marker 2/2cx and 2/3x, but I did notice a stone in the middle of the highway, which is supposed to have number 2/3ax.

2/3bx is far below me, but 2/3cx is on my level again. Here I start the decline towards 2/4x. There is not really a path here and it is quite steep, but doable.
2/5x is just before the railway border crossing. I did not look for marker 2/5ax, it is in between the railway and the road.
Marker 3x is on the other side of the road. The old abandoned border post here is pretty beautiful with the sunlight.
At both sides of the barrier are markers, they have number 3A and 3B.
The "x" is missing here, I have no idea why.
After the abandoned border post the markers conitnue with 3/cx and then 3/1x, which has fallen down.
I did not find 3/1ax, maybe it underwent a similar fate as marker 3/1x.
It should be somewhere around this pole, but the pole does not seem to be related to it. Next up are 3/1bx and 3/2x. Right next to 3/2x is another white stone, I don't know what the meaning of it is. The last stone on this section is 3/2ax. On the other side of the road marker 3/3x is the last one I will visit.
Afterwards I return to the station of Rajka. It has become quite a walk